Viewer snapshot dialog usability improvements.
The viewer snapshot dialog now automatically suggests file names that don't exist yet. If names of existing files are entered, a warning is displayed in real time. If non-writable paths are entered, a warning is displayed as well. git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@20952 383ad7c9-94d9-4d36-a494-682f7c89f535
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